| 99.99th=[78119]
bw ( KiB/s): min= 532, max= 686, per=0.10%, avg=622.87, stdev=24.82, samples= 100
iops : min= 76, max= 98, avg=88.98, stdev= 3.54, samples= 100
- lat (usec) : 250=0.04%, 500=64.11%, 750=4.81%, 1000=2.79%
- lat (msec) : 2=4.16%, 4=1.84%, 10=4.90%, 20=11.33%, 50=5.37%
- lat (msec) : 100=0.65%
+ lat (usec) : 250=0.04%, 500=64.11%, 750=4.81%, 1000=2.79%
+ lat (msec) : 2=4.16%, 4=1.84%, 10=4.90%, 20=11.33%, 50=5.37%
+ lat (msec) : 100=0.65%
cpu : usr=0.27%, sys=0.18%, ctx=12072, majf=0, minf=21
IO depths : 1=85.0%, 2=13.1%, 4=1.8%, 8=0.1%, 16=0.0%, 32=0.0%, >=64=0.0%
submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
complete is basically just CPU time (I/O has already been done, see slat
explanation).
+**lat**
+ Total latency. Same names as slat and clat, this denotes the time from
+ when fio created the I/O unit to completion of the I/O operation.
+
**bw**
Bandwidth statistics based on samples. Same names as the xlat stats,
but also includes the number of samples taken (**samples**) and an
**iops**
IOPS statistics based on samples. Same names as bw.
+**lat (nsec/usec/msec)**
+ The distribution of I/O completion latencies. This is the time from when
+ I/O leaves fio and when it gets completed. Unlike the separate
+ read/write/trim sections above, the data here and in the remaining
+ sections apply to all I/Os for the reporting group. 250=0.04% means that
+ 0.04% of the I/Os completed in under 250us. 500=64.11% means that 64.11%
+ of the I/Os required 250 to 499us for completion.
+
**cpu**
CPU usage. User and system time, along with the number of context
switches this thread went through, usage of system and user time, and
The number of read/write/trim requests issued, and how many of them were
short or dropped.
-**IO latencies**
- The distribution of I/O completion latencies. This is the time from when
- I/O leaves fio and when it gets completed. The numbers follow the same
- pattern as the I/O depths, meaning that 2=1.6% means that 1.6% of the
- I/O completed within 2 msecs, 20=12.8% means that 12.8% of the I/O took
- more than 10 msecs, but less than (or equal to) 20 msecs.
+**IO latency**
+ These values are for `--latency-target` and related options. When
+ these options are engaged, this section describes the I/O depth required
+ to meet the specified latency target.
..
Example output was based on the following: